I work at my company from Monday to Sunday.

Gessho Kassuimokukinkin is a military song in Japan, and its lyrics depict the rigorous training of soldiers.

On April Fools' Day, it's fun to tell jokes and surprise your friends.

Shigetsuka is my best friend.

He is making a futile effort like trying to scoop up the moon from the bottom of the sea.

He continues to chase a dream like chasing the moon in the sea.

He said, 'A nameless star comes out in the evening,' teaching me that achieving a goal is not easy.

I go to the library every month.

A positive-semidefinite matrix is one of the important concepts in linear algebra.

He is studying the shape of a tetrahemihexahedron.